Seabed Forms

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: The Nature Conservancy

Publication_Date: 2021

Title: Seabed Forms

Geospatial_Data_Presentation_Form: Fgdb raster digital data

Description:

Abstract:

This data product was originally created as part of the Northwest Atlantic Marine Ecoregional Assessment. It was updated in 2021 as part of The Nature Conservancy's work on the Marine Mapping Tool.
Seabed forms show the shape of the seafloor. They compare the depth of a site with the information from surrounding locations. For example, areas that are shallower than the surrounding areas can be considered peaks or banks. They are based on a metric called “Benthic Position Index” or BPI. Seabed forms are scale-dependent. This layer combines broad (e.g. banks, depressions) and finer scale features (e.g. scrapes).

To create the seabed forms layer, the Benthic Position Index (BPI) was calculated using a regional bathymetry layer as input. NOAA’s Benthic Terrain Modeler was used for these calculations. BPI was calculated at two separate scales:
“Broad-scale” BPI - inner radius: 9 cells; outer radius: 90 cells, standardized
“Fine-scale” BPI - inner radius: 3 cells; outer radius: 25 cells, standardized
The resulting layers were then reclassified to determine the “features” at both scales. Four classes were created to visualize Broad-scale features: Deep valley, Valley, Peak, and High-peak. For fine-scale features, there are two classes: deep valleys and high peaks. The two resulting layers were them combined to create the final seabed forms.

Purpose:

Developed for an ecoregional assessment and later updated based on updated bathymetry data to inform the Marine Mapping Tool.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2021

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -78.336549

East_Bounding_Coordinate: -62.769232

North_Bounding_Coordinate: 48.190838

South_Bounding_Coordinate: 33.102581

Keywords:

Theme:

Theme_Keyword_Thesaurus:

REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords.

Theme_Keyword: seabed position

Theme_Keyword: slope

Theme_Keyword: seabed forms

Place:

Place_Keyword: Northwest Atlantic

Access_Constraints:

The Nature Conservancy reserves all rights in data provided. All data are provided as is. This is not a survey quality dataset. TNC-derived data analysis cannot be relied on as a definitive statement of the presence or absence of individual species or significant ecological communities at given locations and cannot be substituted for ecological surveys that may be required for environmental assessment or conservation planning. The Nature Conservancy makes no warranty as to the currency, completeness, accuracy or utility of any specific data. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data.

Use_Constraints:

The Nature Conservancy (TNC) compiled this data set from publicly available data sources and this data is freely distributable without permission from this TNC resource office. This data set must be cited on all electronic and hard copy products using the language of the Data Set Credit. Use and analysis of the geographic data are limited by the scale at which the data was collected and mapped, and that, as a regional analysis, it is not intended for site level decisions.
The Nature Conservancy shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any sale, distribution, loan, or offering for use of these digital data, in whole or in part, is prohibited without the approval of the Nature Conservancy. The use of these data to produce other GIS products and services with the intent to sell for a profit is prohibited without the written consent of the Nature Conservancy. All parties receiving these data must be informed of these restrictions. The Nature Conservancy shall be acknowledged as data contributors to any reports or other products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: The Nature Conservancy

Contact_Address:

Address_Type: mailing and physical address

Address: 11 Avenue de Lafayette

City: Boston

State_or_Province: MA

Postal_Code: 02111-1736

Contact_Voice_Telephone: 617-542-1908

Contact_Electronic_Mail_Address: marta.ribera@tnc.org

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3500

Data_Quality_Information:

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: National Geographic Data Center

Title: National Geographic Data Center's Coastal Relief Model

Other_Citation_Details:

Divins, D.L., and D. Metzger, NGDC Coastal Relief Model, <http://www.ngdc.noaa.gov/mgg/coastal/coastal.html>

Online_Linkage: <http://www.ngdc.noaa.gov/mgg/coastal/coastal.html>

Source_Information:

Source_Citation:

Citation_Information:

Originator: The National Ocean Service

Title:

The National Ocean Service (NOS) Hydrographic Data Base (NOSHDB)

Online_Linkage: <http://www.ngdc.noaa.gov/mgg/bathymetry/hydro.html>

Source_Information:

Source_Citation:

Citation_Information:

Originator: Roworth & Signell

Publication_Date: 1998

Title: GOM15CTR: Digital bathymetry contours of the Gulf of Maine

Other_Citation_Details:

The U.S. Geological Survey is conducting studies of the sea floor geology in the Gulf of Maine and along the New England Shelf that provide geologic framework information for habitat, resource, and environmental studies. This data set provides bathymetric contours for the Gulf of Maine GIS project area.

Online_Linkage: <http://pubs.usgs.gov/of/of98-801/bathy/data.htm#Contours>

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon

Point_and_Vector_Object_Count: 55

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Mercator

Mercator:

Standard_Parallel: 0.000000

Longitude_of_Central_Meridian: 0.000000

False_Easting: 0.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:

Abscissa_Resolution: 83.676762

Ordinate_Resolution: 83.676762

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984_Major_Auxiliary_Sphere

Ellipsoid_Name: WGS_1984_Major_Auxiliary_Sphere

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: infinity

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Resolution: 1.000000

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: VAT_NAM_WM_BENTHIC_SBF

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: VALUE

Attribute_Definition: Full EMU value

Attribute:

Attribute_Label: COUNT

Attribute_Definition: Number of grid cells with the full value

Attribute:

Attribute_Label: C_LPI

Attribute_Definition: Code Land Position Index

Attribute:

Attribute_Label: LPI

Attribute_Definition: Description Land Position

Attribute:

Attribute_Label: C_SLOPE

Attribute_Definition: Code Slope

Attribute:

Attribute_Label: SLOPE

Attribute_Definition: Description Slope

Attribute:

Attribute_Label: SEABEDFORM

Attribute_Definition: the description of the Seabedform

Distribution_Information:

Resource_Description: Downloadable Data

Distribution_Liability:

Neither The Nature Conservancy nor any of the ecoregional planning team participants makes any warranty, expressed or implied, as to the use or appropriateness of use of the enclosed data., nor are there warranties of merchantability or fitness for a particular purpose or use. No representation is made as to the currency, accuracy or completeness of this information or of the data sources on which it is based. Neither The Nature Conservancy nor any of the ecoregional planning team participants shall be liable for any lost profits or consequential damages, or claims against the user by third parties.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 0.375

Metadata_Reference_Information:

Metadata_Date: 20211115

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Eastern Resource Office of The Nature Conservancy

Contact_Person: REQUIRED: The person responsible for the metadata information.

Contact_Address:

Address_Type:

REQUIRED: The mailing and/or physical address for the organization or individual.

City: REQUIRED: The city of the address.

State_or_Province: REQUIRED: The state or province of the address.

Postal_Code: REQUIRED: The ZIP or other postal code of the address.

Contact_Voice_Telephone: 617-542-1908

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time